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How to use comma method in Best

Best JavaScript code snippet using best

comma-style.js

Source:comma-style.js

1/**2 * @fileoverview Comma style - enforces comma styles of two types: last and first3 * @author Vignesh Anand aka vegetableman4 */5"use strict";6const astUtils = require("./utils/ast-utils");7//------------------------------------------------------------------------------8// Rule Definition9//------------------------------------------------------------------------------10module.exports = {11    meta: {12        type: "layout",13        docs: {14            description: "enforce consistent comma style",15            category: "Stylistic Issues",16            recommended: false,17            url: "https://eslint.org/docs/rules/comma-style"18        },19        fixable: "code",20        schema: [21            {22                enum: ["first", "last"]23            },24            {25                type: "object",26                properties: {27                    exceptions: {28                        type: "object",29                        additionalProperties: {30                            type: "boolean"31                        }32                    }33                },34                additionalProperties: false35            }36        ],37        messages: {38            unexpectedLineBeforeAndAfterComma: "Bad line breaking before and after ','.",39            expectedCommaFirst: "',' should be placed first.",40            expectedCommaLast: "',' should be placed last."41        }42    },43    create(context) {44        const style = context.options[0] || "last",45            sourceCode = context.getSourceCode();46        const exceptions = {47            ArrayPattern: true,48            ArrowFunctionExpression: true,49            CallExpression: true,50            FunctionDeclaration: true,51            FunctionExpression: true,52            ImportDeclaration: true,53            ObjectPattern: true,54            NewExpression: true55        };56        if (context.options.length === 2 && Object.prototype.hasOwnProperty.call(context.options[1], "exceptions")) {57            const keys = Object.keys(context.options[1].exceptions);58            for (let i = 0; i < keys.length; i++) {59                exceptions[keys[i]] = context.options[1].exceptions[keys[i]];60            }61        }62        //--------------------------------------------------------------------------63        // Helpers64        //--------------------------------------------------------------------------65        /**66         * Modified text based on the style67         * @param {string} styleType Style type68         * @param {string} text Source code text69         * @returns {string} modified text70         * @private71         */72        function getReplacedText(styleType, text) {73            switch (styleType) {74                case "between":75                    return `,${text.replace(astUtils.LINEBREAK_MATCHER, "")}`;76                case "first":77                    return `${text},`;78                case "last":79                    return `,${text}`;80                default:81                    return "";82            }83        }84        /**85         * Determines the fixer function for a given style.86         * @param {string} styleType comma style87         * @param {ASTNode} previousItemToken The token to check.88         * @param {ASTNode} commaToken The token to check.89         * @param {ASTNode} currentItemToken The token to check.90         * @returns {Function} Fixer function91         * @private92         */93        function getFixerFunction(styleType, previousItemToken, commaToken, currentItemToken) {94            const text =95                sourceCode.text.slice(previousItemToken.range[1], commaToken.range[0]) +96                sourceCode.text.slice(commaToken.range[1], currentItemToken.range[0]);97            const range = [previousItemToken.range[1], currentItemToken.range[0]];98            return function(fixer) {99                return fixer.replaceTextRange(range, getReplacedText(styleType, text));100            };101        }102        /**103         * Validates the spacing around single items in lists.104         * @param {Token} previousItemToken The last token from the previous item.105         * @param {Token} commaToken The token representing the comma.106         * @param {Token} currentItemToken The first token of the current item.107         * @param {Token} reportItem The item to use when reporting an error.108         * @returns {void}109         * @private110         */111        function validateCommaItemSpacing(previousItemToken, commaToken, currentItemToken, reportItem) {112            // if single line113            if (astUtils.isTokenOnSameLine(commaToken, currentItemToken) &&114                    astUtils.isTokenOnSameLine(previousItemToken, commaToken)) {115                // do nothing.116            } else if (!astUtils.isTokenOnSameLine(commaToken, currentItemToken) &&117                    !astUtils.isTokenOnSameLine(previousItemToken, commaToken)) {118                const comment = sourceCode.getCommentsAfter(commaToken)[0];119                const styleType = comment && comment.type === "Block" && astUtils.isTokenOnSameLine(commaToken, comment)120                    ? style121                    : "between";122                // lone comma123                context.report({124                    node: reportItem,125                    loc: {126                        line: commaToken.loc.end.line,127                        column: commaToken.loc.start.column128                    },129                    messageId: "unexpectedLineBeforeAndAfterComma",130                    fix: getFixerFunction(styleType, previousItemToken, commaToken, currentItemToken)131                });132            } else if (style === "first" && !astUtils.isTokenOnSameLine(commaToken, currentItemToken)) {133                context.report({134                    node: reportItem,135                    messageId: "expectedCommaFirst",136                    fix: getFixerFunction(style, previousItemToken, commaToken, currentItemToken)137                });138            } else if (style === "last" && astUtils.isTokenOnSameLine(commaToken, currentItemToken)) {139                context.report({140                    node: reportItem,141                    loc: {142                        line: commaToken.loc.end.line,143                        column: commaToken.loc.end.column144                    },145                    messageId: "expectedCommaLast",146                    fix: getFixerFunction(style, previousItemToken, commaToken, currentItemToken)147                });148            }149        }150        /**151         * Checks the comma placement with regards to a declaration/property/element152         * @param {ASTNode} node The binary expression node to check153         * @param {string} property The property of the node containing child nodes.154         * @private155         * @returns {void}156         */157        function validateComma(node, property) {158            const items = node[property],159                arrayLiteral = (node.type === "ArrayExpression" || node.type === "ArrayPattern");160            if (items.length > 1 || arrayLiteral) {161                // seed as opening [162                let previousItemToken = sourceCode.getFirstToken(node);163                items.forEach(item => {164                    const commaToken = item ? sourceCode.getTokenBefore(item) : previousItemToken,165                        currentItemToken = item ? sourceCode.getFirstToken(item) : sourceCode.getTokenAfter(commaToken),166                        reportItem = item || currentItemToken;167                    /*168                     * This works by comparing three token locations:169                     * - previousItemToken is the last token of the previous item170                     * - commaToken is the location of the comma before the current item171                     * - currentItemToken is the first token of the current item172                     *173                     * These values get switched around if item is undefined.174                     * previousItemToken will refer to the last token not belonging175                     * to the current item, which could be a comma or an opening176                     * square bracket. currentItemToken could be a comma.177                     *178                     * All comparisons are done based on these tokens directly, so179                     * they are always valid regardless of an undefined item.180                     */181                    if (astUtils.isCommaToken(commaToken)) {182                        validateCommaItemSpacing(previousItemToken, commaToken,183                            currentItemToken, reportItem);184                    }185                    if (item) {186                        const tokenAfterItem = sourceCode.getTokenAfter(item, astUtils.isNotClosingParenToken);187                        previousItemToken = tokenAfterItem188                            ? sourceCode.getTokenBefore(tokenAfterItem)189                            : sourceCode.ast.tokens[sourceCode.ast.tokens.length - 1];190                    }191                });192                /*193                 * Special case for array literals that have empty last items, such194                 * as [ 1, 2, ]. These arrays only have two items show up in the195                 * AST, so we need to look at the token to verify that there's no196                 * dangling comma.197                 */198                if (arrayLiteral) {199                    const lastToken = sourceCode.getLastToken(node),200                        nextToLastToken = sourceCode.getTokenBefore(lastToken);201                    if (astUtils.isCommaToken(nextToLastToken)) {202                        validateCommaItemSpacing(203                            sourceCode.getTokenBefore(nextToLastToken),204                            nextToLastToken,205                            lastToken,206                            lastToken207                        );208                    }209                }210            }211        }212        //--------------------------------------------------------------------------213        // Public214        //--------------------------------------------------------------------------215        const nodes = {};216        if (!exceptions.VariableDeclaration) {217            nodes.VariableDeclaration = function(node) {218                validateComma(node, "declarations");219            };220        }221        if (!exceptions.ObjectExpression) {222            nodes.ObjectExpression = function(node) {223                validateComma(node, "properties");224            };225        }226        if (!exceptions.ObjectPattern) {227            nodes.ObjectPattern = function(node) {228                validateComma(node, "properties");229            };230        }231        if (!exceptions.ArrayExpression) {232            nodes.ArrayExpression = function(node) {233                validateComma(node, "elements");234            };235        }236        if (!exceptions.ArrayPattern) {237            nodes.ArrayPattern = function(node) {238                validateComma(node, "elements");239            };240        }241        if (!exceptions.FunctionDeclaration) {242            nodes.FunctionDeclaration = function(node) {243                validateComma(node, "params");244            };245        }246        if (!exceptions.FunctionExpression) {247            nodes.FunctionExpression = function(node) {248                validateComma(node, "params");249            };250        }251        if (!exceptions.ArrowFunctionExpression) {252            nodes.ArrowFunctionExpression = function(node) {253                validateComma(node, "params");254            };255        }256        if (!exceptions.CallExpression) {257            nodes.CallExpression = function(node) {258                validateComma(node, "arguments");259            };260        }261        if (!exceptions.ImportDeclaration) {262            nodes.ImportDeclaration = function(node) {263                validateComma(node, "specifiers");264            };265        }266        if (!exceptions.NewExpression) {267            nodes.NewExpression = function(node) {268                validateComma(node, "arguments");269            };270        }271        return nodes;272    }...

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